I definitely noticed the intensity of odors increase greatly when I recently discontinued bupe and started on hydromorphone at a less than equivalent dose. It lasted until I was increased to pain dose that more than covered my bupe withdrawal which was relatively mild but included a rush of testosterone and an increase in sensory sensitivity. My sense of smell was boosted but I don’t think I detected anything I wouldn’t have otherwise it was more a much stronger sense, if that makes sense...
I thought maybe it was b/c of the 20% reduction in benzo dose over the preceding month. I noticed this b/f during some withdrawal but couldn’t place it until you posted. To directly answer the question - yes, definitely I have, and no I don’t think you’re insane.